Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
This circuit is from a 1974 publication. It generates a pulse with several sinusoidal cycles from...
This circuit was found in a publication for radio amateurs in 1976. With it it is possible to...
Found in Unitrode documentation, this oscillator uses some unusual components today such as PU and...